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fontloader error in latex: attempt to call upvalue 'getdirection' (a nil value)
by Ulrike Fischer 11 Jan '19

11 Jan '19

I just tried to import the fontloader from 2019-01-03 into latex, and get on a simple document the error (./test-utf8.aux)error: ...ad/texmf/tex/luatex/luaotfload/fontloader-2019-01-03.lua:23868: attempt to call upvalue 'getdirection' (a nil value) . \newpage ...k \@nobreakfalse \everypar {}\fi \par \ifdim \prevdepth >\z@ \vs... l.51 \end{document} I have no idea (yet) if this is latex specific or if it could affect context too but thought I better mention it. The line refers to this part of the code: pardirstate=function(start) local nxt=getnext(start) local dir=getdirection(start) --<-- if dir==lefttoright then return nxt,1,1 -- Ulrike Fischer https://www.troubleshooting-tex.de/

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Processing XML file inside a zip file
by Aditya Mahajan 10 Jan '19

10 Jan '19

Hi, Is it possible to process an XML file inside a zip file without unzipping? In particular, I have a program that generates zip files which look like this: The file `filename.zip` contains: - filename.xml - file_hash1.png - file_hash2.png etc. Where `filename.xml` (the name matches the basename of the zip file) is the main xml file and the `file_hash1.png` etc are png files that are referred to inside the xml file. If I unzip the file and add \setupexternalfigures[directory={path-to-unzipped-folder] then, I have an \startxmlsetups .. \stopxmlsetups environment that correctly typesets the xml file. I believe that I have seen Hans post snippets of code that suggest that context can directly read from a zip file. So, I am wondering if there is a way that I can just call context --magic-flags filename.zip and obtain the correct output. Thanks, Aditya

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XML and math
by Aditya Mahajan 10 Jan '19

10 Jan '19

Hi, I have an XML file (which is generated via a program that I have no control over), which contains elements as follows: <p> <equation text="$$y_1(t) = 1, t \geq 0$$"> <img alt="$$y_1(t) = 1, t \geq 0$$" class="equation" height="15px" src="Lab01_eq10401623798909303081.png" width="95px"/> </equation> </p> I want to typeset the `text` attribute of equation (and ignore the <img> tag). So, I tried: \startxmlsetups matlab % Bunch of missing definitions \xmlsetsetup{#1}{equation}{matlab:*} \stopxmlsetups \startxmlsetups matlab:equation \xmlatt{#1}{text} \stopxmlsetups This literally typesets `$$y_1(t) = 1, t \geq 0$$`. How can I flush the attribute using ctxcatcodes? (There is \xmlflushcontent, but that is for content and not attributes). Thanks, Aditya

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Setup typing indent next
by Hans Åberg 10 Jan '19

10 Jan '19

There seems to be no option for \setuptyping[indentnext=...] following the TeX convention to indent new paragraphs, as followed by a blank row, but not otherwise.

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issue with backend.date
by Pablo Rodriguez 10 Jan '19

10 Jan '19

Dear list, I have the following sample: \enabledirectives[backend.date=no] \enabledirectives[backend.info=no] \enabledirectives[backend.xmp=no] \starttext a \stoptext At least, backend.date doesn’t work with latest beta (2019.01.07 16:10) as it used to work before. I think this might be a bug. Many thanks for your help, Pablo -- http://www.ousia.tk

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local ToC after each chapter title
by Henning Hraban Ramm 10 Jan '19

10 Jan '19

Hello again, in my current book project I need a local ToC after each chapter title. What’s wrong with my use of "after"? The following example leads to a "TeX capacity exceeded" error: \setupcombinedlist[content][% list={chapter,section},] \setuplist[chapter][ before=, after={\placecombinedlist[content][criterium=local]},] \starttext \completecontent \chapter{One} \section{Knuth} \input knuth \section{Tufte} \input tufte \chapter{Two} \section{Tufte 2} \input tufte \chapter{Three} \section{Zapf} \input zapf \stoptext (MkIV, version 2018.12.19 19:22) Greetlings, Hraban --- https://www.fiee.net http://wiki.contextgarden.net https://www.dreiviertelhaus.de GPG Key ID 1C9B22FD

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final thoughts on experiments with lua
by Thomas A. Schmitz 10 Jan '19

10 Jan '19

I've finished testing my lua script, and it does exactly what I need. I think I'll write a small article about it for one of the next context group proceedings, but wanted to just give a very brief summary that might be of interest to some: Pure Lua is wonderful, but as the language is deliberately kept very small, one sometimes has to find rather cumbersome workarounds. If you run Lua under ConTeXt (with mtxrun --script), you get a version with batteries included, which is perfect for manipulating and analyzing text. Some areas that I found particularly impressive: 1. I've tried several times to make use of lpegs. Hans' code is full of it, and I know that it's fast and extremely versatile, but I found it difficult to wrap my head around its functioning and write useful code with lpegs. The ConTeXt wrapper makes this extremely easy; this is lpeg for the rest of us. It's really a delight to build patterns and see them work immediately! 2. The utf library and string manipulation with characters.(...) is absolutely necessary if you want to handle non-ASCII text because pure Lua gives very unexpected results in this area. These operations work wonderfully with the context libraries. 3. Lua's handling of tables is very efficient and fast. For analyzing my Greek texts, I have to use huge tables for morphological parsing, with more than 900,000 entries. Looking up words in these tables is around 3x faster in Lua than in python! One final thought: one limitation that I still find cumbersome to work around is the fact that associative arrays ("pairs" in Lua speak) do not have an order. When I analyze my texts, I want book numbers, chapters, paragraphs preserved in the order in which they are read (entered into the table). In many cases, it is not possible (or extremely awkward) to sort these numbers, since chapters may be numbered something like 2, 2a, 3, 3α, 3β etc. python has the OrderedDict() in its collections module. In Lua, the best I could find was entering the chapter numbers into an array (ipair) and then retrieve it from there. Maybe there is a better way? All of this just to say how grateful I am for the way Hans, Taco, Wolfgang, Luigi, and the other developers have enhanced Lua. Thanks guys, you make my work much more pleasant and efficient! Thomas

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further experiments with lua
by Thomas A. Schmitz 09 Jan '19

09 Jan '19

Hi Hans, I'm doing some further experiments with the utf and lpeg libraries. This code fails, and I don't understand why: local s = "Ä" print(characters.uccode(s)) mtxrun --script test.lua ./test.lua:3: attempt to index global 'characters' (a nil value) Thomas

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nice overview of tex
by Hans Hagen 09 Jan '19

09 Jan '19

Hi, There are two extensive historic articles on tex here: http://walden-family.com/ieee/texhistory.html -- ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------

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Fwd: issue: multiple viewer layers
by User 19087 08 Jan '19

08 Jan '19

Layers are not properly closed when using more than one layer, so that each layer subsumes all subsequent content. Tested in Adobe Reader 11. I first mentioned this at https://tex.stackexchange.com/a/467005/174577, so I'm basically rehashing all the examples: When \showallmakeup is enabled, all content after \viewerlayer[print] belongs to that layer: \defineviewerlayer[print][state=stop,printable=yes,] \showallmakeup \starttext \viewerlayer[print]{One} more. \samplefile{knuth} \stoptext The same problem as above, demonstrated with \start...stopviewerlayer rather than \viewerlayer: \defineviewerlayer[print][state=stop,printable=yes,] \showallmakeup \starttext \startviewerlayer[print] And then: \stopviewerlayer \samplefile{knuth} \stoptext Rather than two independent layers, the print layer (along with other content) belongs to the view layer. So hiding the view layer hides all content in this document: [view] --- first --- \samplefile{knuth} --- [print] ------ second \defineviewerlayer[print][state=stop,printable=yes,] \defineviewerlayer[view][state=start,printable=no,] \starttext \startviewerlayer[view]{first} \samplefile{knuth} \startviewerlayer[print]{second} \stoptext

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